REVISED 2014 The Paramount Tower, San Francisco Over 22 Million Sold World-Wide
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REVISED
2014
The Paramount Tower, San Francisco Over 22 million sold world wide
REVISED
2014
The Paramount Tower, San Francisco Over 22 Million Sold World-Wide
The NMB SPLICE-SLEEVE® is an efficient coupler for splicing
reinforcing bars which uses a cylindrical-shaped steel
sleeve interior of which is filled with SS MORTAR® grout a
cementicious, non-metallic, non-shrink, high-early-strength
grout. Reinforcing bars to be spliced are inserted into the
sleeve to meet approximately at the center of the sleeve.
The resulting splices will develop tensile and compressive
strengths in excess of the specified minimum for ASTM
Grade 60 bars conforming to the ACI Building Code
Requirements for both Type 1 and Type 2 conditions.
The NMB SPLICE-SLEEVE® SYSTEM is a proven
method for connecting precast reinforced concrete
structural members. At the precast plant, the sleeves
are embedded precast element on one end of the main
reinforcing bars to be connected. The bars protrude
from the other end of the precast member. At the
building site, the precast members are joined by
inserting the protruding bars from the end of one
precast member into the sleeves of the adjacent
member. The sleeves are then grouted, in effect
making the reinforcing bars continuous through the
connection.
This is called "Emulation" and the NMB is
categorized as an emulative connection for
precast systems. (Refer to ACI 550.1R-09 for
more information).
Patented Worldwide
The NMB SPLICE-SLEEVE® is particularly appropriate for
use in joining vertical precast concrete structural elements
(columns and shear walls). This is because the sleeve can
be embedded completely in the precast elements at the
manufacturing yard and when the elements are joined in
the erection process, there is no need to make a closure
pour or to perform other cosmetic patching after the bars
are joined. This is sometimes referred to as a "blind"
connection. When used in cast-in-place situations, the
NMB SPLICE-SLEEVE performs the same function as
other mechanical rebar splicing devices, basically that of
extending the rebar length.
APPLICATIONS
NMB SPLICE-SLEEVES have been used in a number of different applications
both in cast-in-place and precast concrete structures.
Precast Concrete Connections:
Column-to-column
Column-to-beam
Column-to-foundation
Beam-to-beam
Shear wall to shear wall
Shear wall to foundation
Elevator and stair cores
Airport control towers
Bridge piers and Pier caps
Caissons
Large diameter hollow columns
Cast-in-place Concrete Structures:
Connections of prefabricated column reinforcing cages
Connections of new bars to old in vertical and horizontal rehabilitation work
Stress relief joints in post-tensioned cast in place slabs
NMB SPLICE-SLEEVES are installed and held firmly in place in the forms during concrete pouring by
means of a Sleeve Setter featuring a fast-acting cam operated locking device.
The NMB SPLICE-SLEEVE has an integral Rebar Stop
in the mid-portion which assures the specified
embedment of the rebar into the sleeve and an
optional setscrew to hold the bar in the narrow end.
The uniform exterior dimension of the sleeve permits use of stirrups or hoops of the same size
throughout the length of the sleeve.
No special treatment such as threading of rebar ends is required.
NMB SPLICE-SLEEVE can
connect bars of the same
size or any size smaller
than the sleeve size.
The NMB can be epoxy coated and used to connect
epoxy coated bars without removing the coating.
ERECTION
During erection, precast concrete elements are set into position one of three ways (see diagrams). The rebar
dowels projecting from either the foundation or opposite piece are inserted into NMB Splice-Sleeves embedded
in the precast element. The wide (field) end of the sleeves is
designed larger than the rebar to provide tolerance to
accommodate bar misalignment. The sleeve also allows
tolerance with inserted rebar length (See Chart on Page 5).
If needed additional tolerance can be gained by “Upsizing” to a
bigger sleeve. This can be any bigger size but usually one or two.
Similar to Upsizing, different rebar sizes can be “Transition
Spliced” in the NMB Splice-Sleeve (for details see User’s
Manual). These abilities allow all bars to be quickly mated and
grouted simultaneously, saving crane time and speeding
erection.
The precast elements are temporarily braced while the grout
cures sufficiently in the sleeves. Typically EORs specify 4,000 psi
which is comfortably above the yield strength connection. This is
achieved in less than 24 hours at 68℉ (see chart above), contributing to rapid construction.
GROUTING
For PRE-GROUT applications, the SS MORTAR grout is simply poured
into the sleeve and consolidated before the next precast member is set
in position.
For POST-GROUT and HORIZONTAL applications, the grout is
pumped into the sleeve by means of a hand-operated pump. With both
these systems, grouting operations can be performed after bracing and
do not interfere with erection progress.
In total, NMB SPLICE-SLEEVE contributes to speed of construct ion.
NMB SPLICE-SLEEVE
Steel Specification: The material properties of the NMB Splice-Sleeve® iron castings conform to proprietary
specification based on ASTM A536-84. The Models 5U-X and 6U-X satisfy the ASTM A536 Grade 65-45-12
[minimum yield and tensile strength of 65,000 and 45,000 psi respectively], Models 7U-X through Model 14U-X,
Model A11W, and Model SNX 11 satisfy ASTM A536 [Grade 80-55-06] with a Grade of 85-60-06 [minimum yield
and tensile strength of 85,000 and 60,000 psi respectively].
Grout Specification: The grout used in the NMB must be non-metallic, “SS Mortar®”. Minimum grout
strength requirements for ASTM A615 Grade 60 rebars:
Type 2 (ACI) (100% Fu = 150% Fy = 90 ksi) 9,500 psi
Type 1 & AASHTO (125% Fy = 75 ksi) 6,500 psi
Yield Strength (100% Fy = 60 ksi) 3,000 psi
NOTE: To allow for variations in curing, typically cube breaks of 4, 000-psi are specified by the EOR for removal of bracing and continued erection.
DIMENSIONS OF NMB SPLICE-SLEEVES® RECOMMENDED REBAR EMBEDMENT LENGTH
Sleeve No.
Bar Diameter
ASTM Bar Size Sleeve Length
(L) inch
(mm)
Narrow End Diameter Max.
Dia. (B) inch
(mm)
Wide End Diameter Factory Dowel (E1)
inch (mm)
Field Dowel (E2) inch
(mm)
SS Mortar lbs. per Sleeve
(kg) U.S. Metric I.D. (C)
inch (mm)
O.D. (C’) inch
(mm)
I.D. (A) inch
(mm)
Total Tolerance
inch (mm)
O.D. (A’) inch
(mm) Min. Max. Min. Avg. Max.
5U-X 0.625 #5 16 MM 9.65 (245)
0.87 (22)
1.50 (38)
1.81 (46)
1.26 (32)
0.63 (16)
1.89 (48)
4.13 (105)
4.33 (110)
4.13 (105)
4.53 (115)
4.92 (125)
1.26 (0.57)
6U-X 0.750 #6 20 MM 11.22 (285)
1.02 (26)
1.65 (42)
1.97 (50)
1.42 (36)
0.67 (17)
2.05 (52)
4.92 (125)
5.12 (130)
4.92 (125)
5.32 (135)
5.71 (145)
1.76 (0.80)
7U-X 0.875 #7 22 MM 12.80 (325)
1.14 (29)
1.77 (45)
2.28 (58)
1.73 (44)
0.86 (22)
2.36 (60)
5.71 (145)
5.91 (150)
5.71 (145)
6.11 (155)
6.50 (165)
2.65 (1.20)
8U-X 1.000 #8 25 MM 14.57 (370)
1.30 (33)
1.93 (49)
2.48 (63)
1.89 (48)
0.89 (23)
2.52 (64)
6.50 (165)
6.69 (170)
6.50 (165)
6.99 (178)
7.48 (190)
3.46 (1.57)
9U-X 1.128 #9 28 MM 16.34 (415)
1.42 (36)
2.06 (52)
2.60 (66)
2.01 (51)
0.89 (23)
2.67 (68)
7.40 (188)
7.56 (192)
7.40 (188)
7.88 (200)
8.35 (212)
3.95 (1.79)
10U-X 1.270 #10 32 MM 17.91 (455)
1.57 (40)
2.28 (58)
2.80 (71)
2.16 (55)
0.89 (23)
2.87 (73)
8.19 (208)
8.35 (212)
8.19 (208)
8.66 (220)
9.13 (232)
4.94 (2.24)
11U-X 1.410 #11 35 MM 19.49 (495)
1.73 (44)
2.40 (61)
3.03 (77)
2.32 (59)
0.91 (23)
3.03 (77)
8.98 (228)
9.13 (232)
8.98 (228)
9.45 (240)
9.92 (252)
6.02 (2.73)
SNX11 1.410 #11 35 MM 19.09 (485)
1.69 (43)
3.03 (77)
3.03 (77)
2.32 (59)
0.91 (23)
3.03 (77)
8.86 (225)
9.25 (235)
8.27 (210)
8.86 (225)
9.45 (240)
5.71 (2.59)
A11W 1.410 #11 35 MM 19.49 (495)
1.73 (44)
3.31 (84)
3.30 (84)
2.60 (66)
1.19 (30)
3.30 (84)
8.86 (225)
9.69 (246)
8.27 (210)
8.96 (228)
9.50 (241)
6.99 (3.17)
14U-X 1.693 #14 40 MM 24.41 (620)
2.01 (51)
2.80 (71)
3.46 (88)
2.60 (66)
0.91 (23)
3.46 (88)
11.42 (290)
11.61 (295)
11.42 (290)
11.91 (303)
12.40 (315)
9.19 (4.17)
18U 2.257 #18 57 MM 36.22 (920)
2.68 (68)
3.66 (93)
4.72 (120)
3.27 (83)
1.01 (26)
4.25 (108)
17.00 (432)
18.11 (460)
17.00 (432)
17.56 (446)
18.11 (460)
25.31 (11.48)
How to specify NMB SPLICE-SLEEVES:
SPECIFIC: Show sleeve size and grouting system.
Examples: NMB SPLICE SLEEVE 8U-X (PG), 11 U-X (PRE) from Splice Sleeve North America, Inc. Livonia,
Michigan.
GENERIC: Mechanical rebar splices by means of grout-filled steel sleeves with frusto-conical geometry
into which a non-shrink, high-strength grout is introduced using a low pressure pump, the splice to
meet the TYPE 1 or 2 requirements of ACI 318.
AASHTO:
The NMB SPLICE-SLEEVE exceeds the requirements (min. 125%Fy) of the AASHTO, Standard Specification
for Highway Bridges, Division I- Design, Section 8.32.2. This article sets down requirements for fatigue design
of mechanical connections. The NMB is listed generically as the "Grout-filled sleeve (without threaded ends),
with or without epoxy coated rebar", which gains the 18-ksi stress category (highest) under 5 million cycle
testing per NCHRP 10-35 methodology.
APPROVAL AND RECOGNITION
Evaluation Report ESR-: ICC Evaluation Service, Inc.
New York City Board of Standards and Appeals, Calendar No. 329-89-SM
City of Los Angeles, Departments of Building and Safety, Research Report: RR25385
Various U.S. State Department of Transportation
Building Center of Japan, Ministry of Construction
Housing Development Board, Singapore
Ministry of Works and Development, New Zealand
Splice Sleeve North America, Inc. 38777 West Six Mile Road, Suite 205 Livonia, Michigan 48152 For More Information, Call: 734-838-0420 On the Web: www.splicesleeve.com
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